The original message is a few years old and the embedded sign-up form is not an option we have available any more. You can use our API to create your own custom sign-up form. You can reference our API documentation from our developer portal at developer.constantcontact.com.
There are code libraries and code samples as well. The PHP sample does have a sign-up form if you are interested in looking there.
If you are not looking to create your own sign-up form using our API you can log in to your Constant Contact account and click on the link near the top that says Sign-Up Forms and create an Inline or Pop-up Form.
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